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V R,_5 L99 a S tte_ TnspeC ' i 0'Y� 1.0 Introduction The U.S. Environmental Protection Agency (EPA), Region IX, under authority of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) and the Superfund Amendments and Reauthorization Act of 1986 (SARA), has '— tasked URS Consultants, Inc., to conduct a Site Inspection at the Trinkle & Boys site located in Tracy, San Joaquin County, California. The Trinkle & Boys Agricultural Flying Service (Trinkle & Boys) was identified as a potential hazardous waste site and entered into the Comprehensive Environmental Response Compensation, and Liability Information System (CERCLIS) on January 1, 1988, A Preliminary Assessment (PA) was performed for the EPA in February 1988. The purpose of the PA was to review existing information on the site and its environs to assess the threat(s), if any, posed to public health, welfare, or the environment and to ` determine if further investigation under CERCLA/SARA was warranted. After reviewing the PA, EPA decided that further investigation of Trinkle & Boys would be necessary to more completely evaluate the site using the EPA's Hazard Ranking System (HRS) criteria. The HRS assesses the relative threat associated with actual or potential releases of hazardous substances from sites. It is the principal mechanism the EPA uses to place sites on the National Priorities List (NPL). The NPL identifies sites at which EPA may conduct remedial response actions. This Site Inspection (SI) Report summarizes URS' recent investigation. 2.0 Site Description The Trinkle & Boys site is located at 31244 South Highway 33, 7 miles southeast of the city of Tracy, San Joaquin County, California. The geographical coordinates of the Trinkle & Boys site are 37° 40' 15" North Latitude, 122° 19' 46.5" West Longitude; Township 3 South, Range 6 East, Mount Diablo Baseline and Meridian (see Figurel). The site encompasses approximately 23-acres (County Assessor's Parcel Numbers 255-110-92 and 255-110-93) and is zoned for general agriculture (1,2). The Trinkle & Boys aerial application facility consists of two hangars, two primary storage areas, and an airstrip (see Figure 2). One hangar located off of Highway 33 doubles as an office and is used for aircraft repairs and maintenance. A cracked asphalt runway traverses the center of the site in an east-west direction, The runway extends from Highway 33 to approximately 1,800 feet to the east. Immediately east of the office/hangar is the airplane parking strip where airplane engine oil maintenance occurs. About 50 feet east of the airplane parking strip is a fenced 55-gallon barrel storage area. Rusting machinery, rubble, and debris surrounds this fenced storage area. Located along the southern wall of the hangar/office is the chemical batcher and holding tank assembly where chemicals are mixed with water and transferred into the holding tank before being pumped into the airplane's internal holding tanks. Directly south of the office/hangar is the concrete pad and sump area where chemical residues are washed from airplanes and equipment. A fenced chemical storage area is located approximately 160 feet southeast of the sump area. Adjacent to the chemical storage area is a hangar used mainly for machinery storage. North of the chemical storage area is a 6,500-gallon holding tank used to collect rinse-water from the sump. The holding tank is located within the gravel rinse basin which was used as a rinse water disposal site prior to the installation of the sump. URS Consultants, Inc. Page 1